检索结果-南通市图书馆

Experimentally validated atomistic simulation of the effect of relevant grinding parameters on work piece topography,internal stresses,and microstructure

引用

friction 2022年第4期10卷 608-629页

作者： S.J.EDER P.G.GRÜTZMACHER T.SPENGER H.HECKES H.ROJACZ A.NEVOSAD f.haas AC2T research GmbH Viktor-Kaplan-Straße 2/CWiener Neustadt 2700Austria Institute of Engineering Design and Product Development TU WienLehárgasse 6-Objekt 7Vienna 1060Austria Institute of Production Engineering Graz University of TechnologyKopernikusgasse 24/IGraz 8010Austria Tyrolit-Schleifmittelwerke Swarovski K.G. Swarovskistraße 33Schwaz 6130Austria

In this work,we present a fully atomistic approach to modeling a finishing process with the goal to shed light on aspects of work piece development on the microscopic scale,which are difficult or even impossible to observe in experiments,but highly relevant for the resulting material *** a large-scale simulative parametric study,we varied four of the most relevant grinding parameters:The work piece material,the abrasive shape,the temperature,and the infeed *** order to validate our model,we compared the normalized surface roughness,the power spectral densities,the steady-state contact stresses,and the microstructure with proportionally scaled macroscopic experimental *** the grain sizes vary by a factor of more than 1,000 between experiment and simulation,the characteristic process parameters were reasonably reproduced,to some extent even allowing predictions of surface quality degradation due to tool *** the experimentally validated model,we studied time-resolved stress profiles within the ferrite/steel work piece as well as maps of the microstructural changes occurring in the near-surface *** found that blunt abrasives combined with elevated temperatures have the greatest and most complex impact on near-surface microstructure and stresses,as multiple processes are in mutual competition here.

关键词： large-scale molecular dynamics surface quality microstructure Revolutions per minute-Synchronous Grinding(RPM-Synchronous Grinding) tool wear

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Use and Exchange of Biological Control Agents for food and Agriculture

引用

中国生物防治学报 2010年第S1期26卷 123-127页

作者： J.C.van Lenteren M.J.W.Cock J.Brodeur B.Barratt f.Bigler K.Bolckmans f.haas P.G.Mason J.R.P.Parra Laboratory of Entomology Wageningen UniversityP.O.Box80316700 EH WageningenNetherlands CABI Europe-Switzerland Rue des Grillons 1CH-2800 DelémontSwitzerland Institut de recherche en biologie végétale Universitéde Montréal4101rue Sher-brooke EstMontréal(Québec)Canada AgResearch Limited Invermay Agricultural CentrePuddle AlleyPrivate Bag 50034Mos-gielNew Zealand Agroscope Reckenholz-Tanikon Research Station ART Reckenholzstrasse 191CH-8046 ZurichSwitzerland Koppert B.V. Veilingweg 14Postbus 1552650 AD Berkel en RodenrijsThe Netherlands Icipe Duduville CampusKasaraniP.O.Box30772-00100NairobiKenya Agriculture and Agri-food Canada Research CentreK.W.Neatby Building960 Carling AvenueOttawaOntario K1A0C6Canada Departamento de Entomologia Fitopatologia e Zoologia AgrícolaESALQ/USP.Caixa Postal0913418-900 Piracicaba-SPBrazil

The report sets out to summarize the past and current situation regarding the practice of biologicalcontrol inrelationtothe use and exchange of genetic resources relevant for *** considers the twomain categories of biological control:classical and *** access to BCAs for use inanother country imposes no risk of liability to the source *** scientific knowledge abouthabitats,fauna andflora,can be

关键词： The Use and Exchange of Biological Control Agents for food and Agriculture

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Using self-determination theory to identify organizational interventions to support coal mineworkers’ dust-reducing practices

引用

International Journal of Mining Science and Technology 2019年第3期29卷 371-378页

作者： Emily J.haas Centers for Disease Control and Prevention National Institute for Occupational Safety and Health

Advancing the application of safety and health(S&H)technologies is likely to remain a value in the mining ***,any information that technologies generate must be translated from the organization to the workforce in a targeted way to result in sustainable *** a case study approach with continuous personal dust monitors(CPDMs),this paper argues for an organizational focus on technology *** CPDMs provide mineworkers with near real-time feedback about their respirable coal dust exposure,they do not ensure that workers or the organization will continuously use the information to learn about and reduce exposure *** study used self-determination theory(SDT)to help three mines manage and communicate about information learned from the CPDM ***,35 mineworkers participated in two mixed-method data collection efforts to discuss why they do or do not use CPDMs to engage in dust-reducing ***,the data was analyzed to better understand how organizations can improve the integration of technology through their management *** indicate that using the CPDM to reduce sources of dust exposure is consistent with mineworkers’self-values to protect their health and not necessarily because of compliance to a manager or mine.

关键词： Autonomous organization Continuous personal dust monitor Respirable coal mine dust Safety and health management system Self-determination theory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Disposition and Metabolism of 1 -Nitropropane in Rats and Chimpanzees

引用

Biomedical and Environmental Sciences 1989年第3期2卷 249-264页

作者： MARGRET haas-JOBELIUS fRIEDHELM KORTE f.COULSTON Gesellschaft Gesellschaft Technische Universit t München Institut für Chemie Lehrstuhl für kologische Chemie Am L wentor D-8050 freisingWeihenstephan federal Republic of Germany and White Sands Research Center 2512 Christina Place Alamogordo New Mexico 88310 für Strahlen-und Umweltforschung mbH München Institut für kologische Chemie Ingolst dter Landstrasse 1 D-8042 Neuherberg federal Republic of Germany

The metabolic fate of 1 -nitropropane (1-NP) has not been previously reported. In this study male rats and chimpanzees were given single doses of 40 mg/kg ip and 5 mg/kg iv 1-[1-^(14)C]NP, respectively. The quantitative extent of urinary and fecal elimination was similar in both species. The rats excreted 16.5% ofthedosein urine and 1.7% in feces. for chimpanzees the respective values were 14.8 and 1.2%. Experiments with rats demonstrated that the major route of elimination was by exhalation. With a total elimination via the lungs of 72.6%, rats expired 10.3% of the dose as unchanged 1-NP. five polar metabolites were isolated from the urine of chimpanzees. The two major metabolites were identified as 3-hydroxypropionic acid and 7V-methyl-N-2-(methylsulfinyl)ethylpropionic acid amide (NMPA). Both substances were also excreted in rat urine. The two identified metabolites indicate that 1-NP was degraded to propionic acid, part of which was modified to 3-hydroxypropionic acid or NMPA. A hypothetical pathway for the biochemical generation of NMPA is suggested.(c)1989 Academic Press, Inc.

关键词： ppm Nitropropane in Rats and Chimpanzees Disposition and Metabolism of 1

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent results from HERA

引用

Chinese Physics C 2010年第9期34卷 1254-1258页

作者： T.haas Deutsches Elektronensynchrotron

After the end of data taking in 2007,the experiments H1 and ZEUS have entered into an intense phase of data *** results of this effort on neutral （NC） and charged current （CC） cross sections at high Q 2,the longitudinal structure function f L,inclusive diffraction,heavy flavour production and on searches for glueballs are *** shown are results of a combined analysis on inclusive NC and CC cross sections performed by H1 and ZEUS using HERA-I data.

关键词： lepton-proton scattering structure functions QCD glueballs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transplanting neural progenitors to build a neuronal relay across the injured spinal cord

引用

Neural Regeneration Research 2014年第12期9卷 1173-1176页

作者： Christopher haas Itzhak fischer Drexel University College of Medicine Department of Neurobiology & Anatomy

Cellular transplantation for repair of spinal cord injury is a prom- ising therapeutic strategy that includes the use of a variety of neural and non-neural cells isolated or derived from embryonic and adult tissue as well as embryonic stem cells and induced plu- ripotent stem cells. In particular, transplants of neural progenitor cells （NPCs） have been shown to limit secondary injury and scar formation and create a permissive environment in the injured spinal cord through the provision of neurotrophic molecules and growth supporting matrices that promote growth of injured host axons. Importantly, transplants of NPC are unique in their poten- tial to replace lost neural cells - including neurons, astrocytes,

关键词： Transplanting neural progenitors to build a neuronal relay across the injured spinal cord CSPG NPC GRP

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Throughput maximization in UWB-based ad-hoc networks

引用

Science China(Information Sciences) 2010年第12期53卷 2538-2547页

作者： haas Zygmunt J. School of Electrical and Computer Engineering Cornell University

In this paper,we study the problem of radio resource allocation,both transmission rates and transmission powers,so as to maximize the throughput of UWB wireless ad-hoc *** analysis is based on the packet-success function(PSf),which is defined as the probability of a data packet being successfully received as a function of the receiver’s signal-to-interference-and-noise-ratio(SINR).We find an optimal link transmission rate,which maximizes the link’s throughput and is dependent on the all active links transmission *** each link transmission rate is adapted to this optimal link transmission rate,then,with single-link operation(i.e.,no other interference sources are present),the link’s throughput is directly proportional to the transmitter’s power and increases indefinitely with increasing transmission ***,with multiplelinks operation and interference each other,as each link transmitting power increases,so does the interference level,and the total network throughput approaches a constant other than ***,for sufficiently small transmission power,the total network throughput of the multiple-links case exceeds the throughput of the single-link case,but the reverse happens for high *** addition,this paper reveals that,as the number of concurrently transmitting links increases,regardless of the power level,the maximal total network throughput approaches a constant,with each link’s throughput approaching *** maximize the network throughput,for the case of small maximal transmission power with weak interference levels,the optimal transmission scheduling allocates simultaneous transmissions of multiple links,but for the case of large maximal transmission power with strong interference levels,the optimal policy assigns separate time for transmission on each *** breakpoint of when to use one link or multiple links is termed the critical *** an example of the analytical calculation of the critical link’s power,we present here so

关键词： UWB impulse radio ad-hoc networks throughput rate power resource allocation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Electron Tomography in Plant Cell Biology

引用

Journal of Integrative Plant Biology 2007年第8期49卷 1091-1099页

作者： ThomasJ.haas MarisaS.Otegui Department of Botany University of Wisconsin-MadisonMadisonWI 53706USA

This review focuses on the contribution of electron tomography-based techniques to our understanding of cellular processes in plant cells. Electron microscopy techniques have evolved to provide better three-dimensional resolution and improved preservation of the subcellular components. In particular, the combination of cryofixation/freeze substitution and electron tomography have allowed plant cell biologists to image organelles and macromolecular complexes in their native cellular context with unprecedented three-dimensional resolution （4-7 nm）. Until now, electron tomography has been applied in plant cell biology for the study of cytokinesis, Golgi structure and trafficking, formation of plant endosome/prevacuolar compartments, and organization of photosynthetic membranes. We discuss in this review the new insights that these tomographic studies have brought to the plant biology field.

关键词： cell structure electron tomography high-pressure freezing/freeze substitution.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Wireless data transmission using visual codes

引用

Photonics Research 2014年第5期2卷 150-160页

作者： Thilo fath falk Schubert Harald haas Institute for Digital Communications University of EdinburghEH93JL EdinburghUK Innovation Works Germany EADS Deutschland GmbH81663 MunichGermany

In this paper,a new approach for wireless data transmission within an aircraft cabin is *** proposed application enables the transmission of data to a passenger’s user *** wireless in-flight applications are subject to strict frequency and electromagnetic compatibility(EMC)regulations,the data is transferred by optical wireless transmission,specifically by two-dimensional visual *** this end,black-and-white or colored visual code sequences are displayed on the in-flight entertainment *** visual codes are captured by the built-in camera of the passenger’s mobile device and are decoded to reconstruct the transmitted *** order to compensate for frame losses caused by effects like occlusion and motion blur,a temporal forward error correction coding scheme is *** experiments within an Airbus A330 cabin mock-up demonstrate the functionality of the implemented system under realistic conditions such as ambient illumination and geometric *** user devices are used for evaluation;specifically,a low-cost and a high-end smartphone are employed as *** evaluations show that the proposed transmission system achieves data rates of up to 120 kbit/s per individual passenger seat with these user *** the user device has no physical connection to the sensitive on-board system,the proposed transmission system provides an intrinsic safety feature.

关键词： visual illumination correction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Domestication and crop evolution of wheat andbarley: Genes, genomics, and future directions

引用

Journal of Integrative Plant Biology 2019年第3期61卷 204-225页

作者： Matthew haas Mona Schreiber Martin Mascher Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) Gatersleben Palaeogenetics Group Institute of Organismic and Molecular Evolution Johannes Gutenberg University Mainz German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig

Wheat and barley are two of the founder crops of the agricultural revolution that took place 10,000 years ago in the fertile Crescent and both crops remain among the world's most important crops. Domestication of these crops from their wild ancestors required the evolution of traits useful to humans, rather than survival in their natural environment. Of these traits, grain retention and threshability, yield improvement, changes to photoperiod sensitivity and nutritional value are most pronounced between wild and domesticated forms. Knowledge about the geographical origins of these crops and the genes responsible for domestication traits largely pre-dates the era of nextgeneration sequencing, although sequencing will lead to new insights. Molecular markers were initially used to calculate distance(relatedness), genetic diversity and to generate genetic maps which were useful in cloning major domestication genes. Both crops are characterized by large,complex genomes which were long thought to be beyond the scope of whole-genome sequencing. However, advances in sequencing technologies have improved the state of genomic resources for both wheat and barley. The availability of reference genomes for wheat and some of its progenitors,as well as for barley, sets the stage for answering unresolved questions in domestication genomics of wheat and barley.

关键词： Domestication Wheat barley

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：